A and B drive to a petrol pump. A says “I want 20 litres of petrol” and B says “I want Rs. 2,000/- worth of petrol”. What can you say about A and B’s demand curves of petrol?

A and B drive to a petrol pump. A says “I want 20 litres of
petrol” and B says “I want Rs. 2,000/- worth of petrol”. What
can you say about A and B’s demand curves of petrol?